<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input v-model="val" type="text">
        <button @click="addItem">添加</button>
        <div>
            <h2>
                正在进行 ----{{len}}
            </h2>
            <ul>
                <li v-for="(item,index) in arr" v-show="!item.checked">
                    <input v-model="item.checked" type="checkbox">
                    {{item.val}}
                    <button @click="del(item)" >删除</button>
                </li>
            </ul>

            <h2>
                已经完成  ---  {{ arr.length - len }}
            </h2>
            <ul>
                <li v-for="(item, index) in arr" v-show = "item.checked">
                    <input v-model = "item.checked" type="checkbox">
                    {{ item.val }}     
                    <button @click="del(item)">删除</button>
                </li>
            </ul>
        </div>

    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        new Vue({
            el: "#app",
            data: {
                val: "",
                arr: []
            },
            created(){
                var datas=this.arr.filter((item)=>{
                    return item ===2 
                })
                console.log(datas)
            },
            computed: {
                len() {
                    return this.arr.filter((item) => {
                        return item.checked === false
                    }).length
                }
            },
            methods:{
                addItem(){
                    this.arr.push({
                        val:this.val,
                        checked:false
                    })
                    this.val=""
                },
                del(item){
                    this.arr.splice(this.arr.indexOf(item),1)
                }
            }
        })
    </script>
</body>
</html>